Perspective Transformation Algorithm for Light Field Image

Fig. 2. Perspective transformation results of light field image with black holes. (a) Input central subaperture view image; (b) perspective transformation result of single subaperture view image; (c) perspective transformation fusion result of all subaperture view images

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Fig. 3. Light field image restoration results based on disparity priority. (a) Subaperture view image to be restored; (b) subaperture disparity map before restoration; (c) restored subaperture view image; (d) restored subaperture disparity map

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Fig. 4. Restoration order of all subaperture views in light field image

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Fig. 5. Results of light field perspective transformation and restoration. (a1)-(f1) Input central subaperture view images; (a2)-(f2) perspective transformation results; (a3)-(f3) restored perspective transformation results

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Fig. 6. Comparison of light field image perspective transformation results. (a1)-(c1) Results of method in Ref. [8]; (a2)-(c2) results of method in Ref. [9]; (a3)-(c3) results of proposed method; (a4)-(c4) truth images

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Table 1. Parameters for perspective transformation
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Table 1. Parameters for perspective transformation
Parameter Fig. 5(a) Fig. 5(b) Fig. 5(c) Fig. 5(d) Fig. 5(e) Fig. 5(f)
b /mm 1.00 1.00 1.50 1.12 1.65 0.86
T_x /mm -20 -20 -30 -60 -45 -50
T_y /mm 0 0 0 0 0 0
T_z /mm 0 0 0 0 0 0
R_x /(°) 0 0 0 1 0.5 0.5
R_y /(°) 0 0.5 0.5 1 0.5 0.5
R_z /(°) 0 0 0 5 -3 -3

Table 2. Consuming time of proposed algorithm
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Table 2. Consuming time of proposed algorithm
Parameter Fig. 5(a) Fig. 5(b) Fig. 5(c) Fig. 5(d) Fig. 5(e) Fig. 5(f)
T / s 283.98 286.95 305.79 302.98 298.11 282.24

Table 3. Quantitative analysis for light field perspective transformation images

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Table 3. Quantitative analysis for light field perspective transformation images

Parameter	Method	Fig. 6(a)	Fig. 6(b)	Fig. 6(c)
	Method in Ref. [8]	23.18	22.38	22.72
PSNR	Method in Ref. [9]	26.35	22.06	22.53
	Proposed	35.43	25.69	30.74
	Method inRef. [8]	0.67	0.81	0.79
SSIM	Method in Ref. [9]	0.78	0.81	0.79
	Proposed	0.96	0.89	0.95

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Jianming Wang, Yiming Mao, Tao Yan, Yuan Liu. Perspective Transformation Algorithm for Light Field Image[J]. Laser & Optoelectronics Progress, 2019, 56(15): 151003

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